Add name mangling support for functions with a thrown error type

docs/ABI/Mangling.rst

@@ -646,6 +646,9 @@ Types
     global-actor :: = type 'Yc'                // Global actor on function type
   #endif
   throws ::= 'K'                             // 'throws' annotation on function types
+  #if SWIFT_RUNTIME_VERSION >= 5.11
+    throws ::= type 'YK'                     // 'throws(type)' annotation on function types
+  #endif
   differentiable ::= 'Yjf'                   // @differentiable(_forward) on function type
   differentiable ::= 'Yjr'                   // @differentiable(reverse) on function type
   differentiable ::= 'Yjd'                   // @differentiable on function type

include/swift/AST/ASTDemangler.h

@@ -144,7 +144,8 @@ class ASTBuilder {
   Type createFunctionType(
       ArrayRef<Demangle::FunctionParam<Type>> params,
       Type output, FunctionTypeFlags flags,
-      FunctionMetadataDifferentiabilityKind diffKind, Type globalActor);
+      FunctionMetadataDifferentiabilityKind diffKind, Type globalActor,
+      Type thrownError);
 
   Type createImplFunctionType(
       Demangle::ImplParameterConvention calleeConvention,

include/swift/Demangling/DemangleNodes.def

@@ -286,6 +286,7 @@ NODE(BaseConformanceDescriptor)
 NODE(AssociatedTypeDescriptor)
 NODE(AsyncAnnotation)
 NODE(ThrowsAnnotation)
+NODE(TypedThrowsAnnotation)
 NODE(EmptyList)
 NODE(FirstElementMarker)
 NODE(VariadicMarker)

include/swift/Demangling/TypeDecoder.h

@@ -855,11 +855,29 @@ class TypeDecoder {
         ++firstChildIdx;
       }
 
+      BuiltType thrownErrorType = BuiltType();
       bool isThrow = false;
       if (Node->getChild(firstChildIdx)->getKind()
             == NodeKind::ThrowsAnnotation) {
         isThrow = true;
         ++firstChildIdx;
+      } else if (Node->getChild(firstChildIdx)->getKind()
+                   == NodeKind::TypedThrowsAnnotation) {
+        isThrow = true;
+
+        auto child = Node->getChild(firstChildIdx);
+        if (child->getNumChildren() < 1) {
+          return MAKE_NODE_TYPE_ERROR0(child,
+                                       "Thrown error node is missing child");
+        }
+
+        auto thrownErrorResult =
+            decodeMangledType(child->getChild(0), depth + 1);
+        if (thrownErrorResult.isError())
+          return thrownErrorResult;
+
+        thrownErrorType = thrownErrorResult.getType();
+        ++firstChildIdx;
       }
 
       bool isSendable = false;
@@ -905,8 +923,10 @@ class TypeDecoder {
                             /*forRequirement=*/false);
       if (result.isError())
         return result;
+
       return Builder.createFunctionType(
-          parameters, result.getType(), flags, diffKind, globalActorType);
+          parameters, result.getType(), flags, diffKind, globalActorType,
+          thrownErrorType);
     }
     case NodeKind::ImplFunctionType: {
       auto calleeConvention = ImplParameterConvention::Direct_Unowned;

include/swift/Remote/MetadataReader.h

@@ -1001,8 +1001,11 @@ class MetadataReader {
       #undef CASE
       }
 
+      BuiltType thrownError = BuiltType();
+      // FIXME: Read from metadata.
+
       auto BuiltFunction = Builder.createFunctionType(
-          Parameters, Result, flags, diffKind, globalActor);
+          Parameters, Result, flags, diffKind, globalActor, thrownError);
       TypeCache[TypeCacheKey] = BuiltFunction;
       return BuiltFunction;
     }

include/swift/RemoteInspection/TypeRef.h

@@ -485,11 +485,13 @@ class FunctionTypeRef final : public TypeRef {
   FunctionTypeFlags Flags;
   FunctionMetadataDifferentiabilityKind DifferentiabilityKind;
   const TypeRef *GlobalActor;
+  const TypeRef *ThrownError;
 
   static TypeRefID Profile(const std::vector<Param> &Parameters,
                            const TypeRef *Result, FunctionTypeFlags Flags,
                            FunctionMetadataDifferentiabilityKind DiffKind,
-                           const TypeRef *GlobalActor) {
+                           const TypeRef *GlobalActor,
+                           const TypeRef *ThrownError) {
     TypeRefID ID;
     for (const auto &Param : Parameters) {
       ID.addString(Param.getLabel().str());
@@ -500,6 +502,7 @@ class FunctionTypeRef final : public TypeRef {
     ID.addInteger(static_cast<uint64_t>(Flags.getIntValue()));
     ID.addInteger(static_cast<uint64_t>(DiffKind.getIntValue()));
     ID.addPointer(GlobalActor);
+    ID.addPointer(ThrownError);
 
     return ID;
   }
@@ -508,18 +511,20 @@ class FunctionTypeRef final : public TypeRef {
   FunctionTypeRef(std::vector<Param> Params, const TypeRef *Result,
                   FunctionTypeFlags Flags,
                   FunctionMetadataDifferentiabilityKind DiffKind,
-                  const TypeRef *GlobalActor)
+                  const TypeRef *GlobalActor,
+                  const TypeRef *ThrownError)
       : TypeRef(TypeRefKind::Function), Parameters(Params), Result(Result),
         Flags(Flags), DifferentiabilityKind(DiffKind),
-        GlobalActor(GlobalActor) {}
+        GlobalActor(GlobalActor), ThrownError(ThrownError) {}
 
   template <typename Allocator>
   static const FunctionTypeRef *create(
       Allocator &A, std::vector<Param> Params, const TypeRef *Result,
       FunctionTypeFlags Flags, FunctionMetadataDifferentiabilityKind DiffKind,
-      const TypeRef *GlobalActor) {
+      const TypeRef *GlobalActor, const TypeRef *ThrownError) {
     FIND_OR_CREATE_TYPEREF(
-        A, FunctionTypeRef, Params, Result, Flags, DiffKind, GlobalActor);
+        A, FunctionTypeRef, Params, Result, Flags, DiffKind, GlobalActor,
+        ThrownError);
   }
 
   const std::vector<Param> &getParameters() const { return Parameters; };
@@ -540,6 +545,10 @@ class FunctionTypeRef final : public TypeRef {
     return GlobalActor;
   }
 
+  const TypeRef *getThrownError() const {
+    return ThrownError;
+  }
+
   static bool classof(const TypeRef *TR) {
     return TR->getKind() == TypeRefKind::Function;
   }

include/swift/RemoteInspection/TypeRefBuilder.h

@@ -793,9 +793,9 @@ class TypeRefBuilder {
       llvm::ArrayRef<remote::FunctionParam<const TypeRef *>> params,
       const TypeRef *result, FunctionTypeFlags flags,
       FunctionMetadataDifferentiabilityKind diffKind,
-      const TypeRef *globalActor) {
+      const TypeRef *globalActor, const TypeRef *thrownError) {
     return FunctionTypeRef::create(
-        *this, params, result, flags, diffKind, globalActor);
+        *this, params, result, flags, diffKind, globalActor, thrownError);
   }
 
   const FunctionTypeRef *createImplFunctionType(
@@ -852,7 +852,7 @@ class TypeRefBuilder {
 
     auto result = createTupleType({}, llvm::ArrayRef<llvm::StringRef>());
     return FunctionTypeRef::create(
-        *this, {}, result, funcFlags, diffKind, nullptr);
+        *this, {}, result, funcFlags, diffKind, nullptr, nullptr);
   }
 
   BuiltType createProtocolTypeFromDecl(BuiltProtocolDecl protocol) {

lib/AST/ASTDemangler.cpp

@@ -390,7 +390,8 @@ void ASTBuilder::endPackExpansion() {
 Type ASTBuilder::createFunctionType(
     ArrayRef<Demangle::FunctionParam<Type>> params,
     Type output, FunctionTypeFlags flags,
-    FunctionMetadataDifferentiabilityKind diffKind, Type globalActor) {
+    FunctionMetadataDifferentiabilityKind diffKind, Type globalActor,
+    Type thrownError) {
   // The result type must be materializable.
   if (!output->isMaterializable()) return Type();
 
@@ -454,9 +455,6 @@ Type ASTBuilder::createFunctionType(
     clangFunctionType = Ctx.getClangFunctionType(funcParams, output,
                                                  representation);
 
-  // FIXME: Populate thrownError
-  Type thrownError;
-
   auto einfo =
       FunctionType::ExtInfoBuilder(representation, noescape, flags.isThrowing(),
                                    thrownError, resultDiffKind,

lib/AST/ASTMangler.cpp

@@ -2825,8 +2825,14 @@ void ASTMangler::appendFunctionSignature(AnyFunctionType *fn,
     appendOperator("Ya");
   if (fn->isSendable())
     appendOperator("Yb");
-  if (fn->isThrowing())
-    appendOperator("K");
+  if (auto thrownError = fn->getEffectiveThrownErrorType()) {
+    if ((*thrownError)->isEqual(fn->getASTContext().getErrorExistentialType())){
+      appendOperator("K");
+    } else {
+      appendType(*thrownError, sig);
+      appendOperator("YK");
+    }
+  }
   switch (auto diffKind = fn->getDifferentiabilityKind()) {
   case DifferentiabilityKind::NonDifferentiable:
     break;

lib/Demangling/Demangler.cpp

@@ -926,6 +926,8 @@ NodePointer Demangler::demangleTypeAnnotation() {
   case 'k':
     return createType(
         createWithChild(Node::Kind::NoDerivative, popTypeAndGetChild()));
+  case 'K':
+    return createWithChild(Node::Kind::TypedThrowsAnnotation, popTypeAndGetChild());
   case 't':
     return createType(
         createWithChild(Node::Kind::CompileTimeConst, popTypeAndGetChild()));
@@ -1530,7 +1532,10 @@ NodePointer Demangler::popFunctionType(Node::Kind kind, bool hasClangType) {
   addChild(FuncType, ClangType);
   addChild(FuncType, popNode(Node::Kind::GlobalActorFunctionType));
   addChild(FuncType, popNode(Node::Kind::DifferentiableFunctionType));
-  addChild(FuncType, popNode(Node::Kind::ThrowsAnnotation));
+  addChild(FuncType, popNode([](Node::Kind kind) {
+    return kind == Node::Kind::ThrowsAnnotation ||
+      kind == Node::Kind::TypedThrowsAnnotation;
+  }));
   addChild(FuncType, popNode(Node::Kind::ConcurrentFunctionType));
   addChild(FuncType, popNode(Node::Kind::AsyncAnnotation));
 
@@ -1572,7 +1577,9 @@ NodePointer Demangler::popFunctionParamLabels(NodePointer Type) {
         == Node::Kind::DifferentiableFunctionType)
     ++FirstChildIdx;
   if (FuncType->getChild(FirstChildIdx)->getKind()
-        == Node::Kind::ThrowsAnnotation)
+        == Node::Kind::ThrowsAnnotation ||
+      FuncType->getChild(FirstChildIdx)->getKind()
+        == Node::Kind::TypedThrowsAnnotation)
     ++FirstChildIdx;
   if (FuncType->getChild(FirstChildIdx)->getKind()
         == Node::Kind::ConcurrentFunctionType)

lib/Demangling/NodePrinter.cpp

@@ -557,6 +557,7 @@ class NodePrinter {
     case Node::Kind::GlobalActorFunctionType:
     case Node::Kind::AsyncAnnotation:
     case Node::Kind::ThrowsAnnotation:
+    case Node::Kind::TypedThrowsAnnotation:
     case Node::Kind::EmptyList:
     case Node::Kind::FirstElementMarker:
     case Node::Kind::VariadicMarker:
@@ -863,7 +864,7 @@ class NodePrinter {
 
     unsigned argIndex = node->getNumChildren() - 2;
     unsigned startIndex = 0;
-    bool isSendable = false, isAsync = false, isThrows = false;
+    bool isSendable = false, isAsync = false;
     auto diffKind = MangledDifferentiabilityKind::NonDifferentiable;
     if (node->getChild(startIndex)->getKind() == Node::Kind::ClangType) {
       // handled earlier
@@ -880,10 +881,15 @@ class NodePrinter {
           (MangledDifferentiabilityKind)node->getChild(startIndex)->getIndex();
       ++startIndex;
     }
-    if (node->getChild(startIndex)->getKind() == Node::Kind::ThrowsAnnotation) {
+
+    Node *thrownErrorNode = nullptr;
+    if (node->getChild(startIndex)->getKind() == Node::Kind::ThrowsAnnotation ||
+        node->getChild(startIndex)->getKind()
+          == Node::Kind::TypedThrowsAnnotation) {
+      thrownErrorNode = node->getChild(startIndex);
       ++startIndex;
-      isThrows = true;
     }
+
     if (node->getChild(startIndex)->getKind()
             == Node::Kind::ConcurrentFunctionType) {
       ++startIndex;
@@ -923,8 +929,9 @@ class NodePrinter {
     if (isAsync)
       Printer << " async";
 
-    if (isThrows)
-      Printer << " throws";
+    if (thrownErrorNode) {
+      print(thrownErrorNode, depth + 1);
+    }
 
     print(node->getChild(argIndex + 1), depth + 1);
   }
@@ -2909,10 +2916,16 @@ NodePointer NodePrinter::print(NodePointer Node, unsigned depth,
     return nullptr;
   }
   case Node::Kind::AsyncAnnotation:
-    Printer << " async ";
+    Printer << " async";
     return nullptr;
   case Node::Kind::ThrowsAnnotation:
-    Printer << " throws ";
+    Printer << " throws";
+    return nullptr;
+  case Node::Kind::TypedThrowsAnnotation:
+    Printer << " throws(";
+    if (Node->getNumChildren() == 1)
+      print(Node->getChild(0), depth + 1);
+    Printer << ")";
     return nullptr;
   case Node::Kind::EmptyList:
     Printer << " empty-list ";

lib/Demangling/OldRemangler.cpp

@@ -829,6 +829,11 @@ ManglingError Remangler::mangleThrowsAnnotation(Node *node, unsigned depth) {
   return ManglingError::Success;
 }
 
+ManglingError Remangler::mangleTypedThrowsAnnotation(Node *node, unsigned depth) {
+  Buffer << "z";
+  return ManglingError::Success;
+}
+
 ManglingError Remangler::mangleDifferentiableFunctionType(Node *node,
                                                           unsigned depth) {
   Buffer << "D";

lib/Demangling/Remangler.cpp

@@ -3273,6 +3273,12 @@ ManglingError Remangler::mangleThrowsAnnotation(Node *node, unsigned depth) {
   return ManglingError::Success;
 }
 
+ManglingError Remangler::mangleTypedThrowsAnnotation(Node *node, unsigned depth) {
+  RETURN_IF_ERROR(mangleChildNodes(node, depth + 1));
+  Buffer << "YK";
+  return ManglingError::Success;
+}
+
 ManglingError Remangler::mangleEmptyList(Node *node, unsigned depth) {
   Buffer << 'y';
   return ManglingError::Success;

stdlib/public/RemoteInspection/TypeRef.cpp

@@ -781,6 +781,7 @@ class DemanglingForTypeRef
 
     if (F->getFlags().isThrowing())
       funcNode->addChild(Dem.createNode(Node::Kind::ThrowsAnnotation), Dem);
+    // FIXME: TypedThrowsAnnotation
     if (F->getFlags().isSendable()) {
       funcNode->addChild(
           Dem.createNode(Node::Kind::ConcurrentFunctionType), Dem);
@@ -1166,12 +1167,16 @@ class ThickenMetatype
     if (F->getGlobalActor())
       globalActorType = visit(F->getGlobalActor());
 
+    const TypeRef *thrownErrorType = nullptr;
+    if (F->getThrownError())
+      thrownErrorType = visit(F->getThrownError());
+
     auto SubstitutedResult = visit(F->getResult());
 
     return FunctionTypeRef::create(Builder, SubstitutedParams,
                                    SubstitutedResult, F->getFlags(),
                                    F->getDifferentiabilityKind(),
-                                   globalActorType);
+                                   globalActorType, thrownErrorType);
   }
 
   const TypeRef *
@@ -1303,10 +1308,14 @@ class TypeRefSubstitution
     if (F->getGlobalActor())
       globalActorType = visit(F->getGlobalActor());
 
+    const TypeRef *thrownErrorType = nullptr;
+    if (F->getThrownError())
+      thrownErrorType = visit(F->getThrownError());
+
     return FunctionTypeRef::create(Builder, SubstitutedParams,
                                    SubstitutedResult, F->getFlags(),
                                    F->getDifferentiabilityKind(),
-                                   globalActorType);
+                                   globalActorType, thrownErrorType);
   }
 
   const TypeRef *

stdlib/public/runtime/Demangle.cpp

@@ -807,6 +807,7 @@ swift::_swift_buildDemanglingForMetadata(const Metadata *type,
     }
     if (func->isThrowing())
       funcNode->addChild(Dem.createNode(Node::Kind::ThrowsAnnotation), Dem);
+    // FIXME: TypedThrowsAnnotation
     if (func->isSendable()) {
       funcNode->addChild(
           Dem.createNode(Node::Kind::ConcurrentFunctionType), Dem);

stdlib/public/runtime/MetadataLookup.cpp

@@ -1934,7 +1934,7 @@ class DecodedMetadataBuilder {
       llvm::ArrayRef<Demangle::FunctionParam<BuiltType>> params,
       BuiltType result, FunctionTypeFlags flags,
       FunctionMetadataDifferentiabilityKind diffKind,
-      BuiltType globalActorType) const {
+      BuiltType globalActorType, BuiltType thrownError) const {
     assert(
         (flags.isDifferentiable() && diffKind.isDifferentiable()) ||
         (!flags.isDifferentiable() && !diffKind.isDifferentiable()));
@@ -1969,6 +1969,8 @@ class DecodedMetadataBuilder {
       flags = flags.withGlobalActor(true);
     }
 
+    // FIXME: thrownError
+
     return BuiltType(
       flags.hasGlobalActor()
         ? swift_getFunctionTypeMetadataGlobalActor(flags, diffKind, paramTypes.data(),

test/Demangle/Inputs/manglings.txt

@@ -449,3 +449,4 @@ $s9MacroUser016testFreestandingA9ExpansionyyF4Foo3L_V23bitwidthNumberedStructsfM
 @__swiftmacro_9MacroUser16MemberNotCoveredV33_4361AD9339943F52AE6186DD51E04E91Ll0dE0fMf0_ ---> freestanding macro expansion #2 of NotCovered(in _4361AD9339943F52AE6186DD51E04E91) in MacroUser.MemberNotCovered
 $sxSo8_NSRangeVRlzCRl_Cr0_llySo12ModelRequestCyxq_GIsPetWAlYl_TC ---> coroutine continuation prototype for @escaping @convention(thin) @convention(witness_method) @yield_once <A, B where A: AnyObject, B: AnyObject> @substituted <A> (@inout A) -> (@yields @inout __C._NSRange) for <__C.ModelRequest<A, B>>
 $SyyySGSS_IIxxxxx____xsIyFSySIxx_@xIxx____xxI ---> $SyyySGSS_IIxxxxx____xsIyFSySIxx_@xIxx____xxI
+$s12typed_throws15rethrowConcreteyyAA7MyErrorOYKF --> typed_throws.rethrowConcrete() throws(typed_throws.MyError) -> ()